After failing to earn himself a contract with ROH, Riley moved to Japan and trained more with the legendary, Antonio Inoki. Riley spent three months training with Inoki before he signed a contract with New Japan Pro Wrestling (NJPW) in December 2005.

While in New Japan Pro Wrestling, Riley was a five-time IWGP World Heavyweight Champion, one-time IWGP Intercontinental Champion as well as a two-time IWGP Tag Team Champion with partners Yujiro Takahashi and Hiroshi Tanahashi.

Riley was known as a daredevil and was referred to as "Osore shirazu" which translates to fearless in Japanese. In August 2009 Riley won the annual G1 Climax Tournament held in Japan.

In November 2013 and after almost nine years in the business and at the age of 27, Riley retired from wrestling, stating that as much as he loved the wrestling business and believed he had a lot more in him, he wanted to step away and focus on his family and that he had a great run and he left the possibility of a return.

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Riley was born on October 1, 1986, in Miami, Florida. Son to Caroline and David Riley, he has one older sibling—Thomas. Riley attended Miami Jackson Senior High School; after graduating from Miami Jackson in 2003 Riley attended Florida International University with a degree in Biology. While in college—Riley continued to pursue his dream of being a professional wrestler and after he failed to get himself a contract with Ring of Honor (ROH) — Riley dropped out of college and moved to Japan.

Riley lived on the streets for a bit before being taken in by legendary wrestling promoter—Antonio Inoki. There Inoki would begin training Riley and was like a father figure to him and managed to help him adapt to the Japanese culture.

While Riley was in College he was contacted by Rob Feinstein and was asked if he wanted to possibly try out for his wrestling promotion Ring of Honor. Riley agreed and was placed in various tryout matches and began training with CM Punk and AJ Styles to see if he deserved a spot on the roster. After competing in tryout matches for seven months Riley wasn't able to impress management enough despite Styles' attempts and persuasion to sign him to a contract.

Riley was signed to a contract with New Japan Pro Wrestling in December 2005 and continued his training with NJPW founder, Antonio Inoki. After training for three months, Riley made his debut as a face in NJPW under the ring name—Riley Daniels on April 15, 2005. Riley would compete in matches against the likes of Yujiro Takahashi, Kota Ibushi, Yuji Nagata. That is when Riley earned the nickname, Osore shirazu meaning fearless as he would put on a show for the fans. Riley was involved in the Young Lion Cup however he came in third place next to Hiroyuki Ito and winner Hirooki Goto.

Riley following this started a rivalry with Black Tiger IV and would face him for his IWGP Junior Heavyweight Championship at a live event however was unsuccessful. The two would continue the rivalry for the next two months before it was ended and Riley started a rivalry with Koji Kanemoto which lasted for eight months. Following his long and heated rivalry with Kanemoto, at a very special televised show Riley would go on to defeat at the time current IWGP Heavyweight Champion, Hiroshi Tanahashi.

Riley formed an alliance with Yujiro Takahashi and soon the two began racking up tag team victories so they were placed in a match with the at the time reigning Tag Team Champions, Manabu Nakanishi and Takao Omori and were able to score a non-title win over them. A few weeks later the two teams faced off again this time in a brutal ladder match with Riley able to climb the ladder and grab the titles capturing his first championship since joining NJPW.

Riley and Takahashi would go on to hold the titles for five months before losing them to Giant Bernard and Travis Tomko. After losing the titles a feud ignited between the two former teammates and lasted for months with Riley coming out on top. Riley would former another alliance with Tetsuya Naitō and the two would challenge Giant Bernard and Travis Tomko for the Tag Team Championships on a few occasions however they were unsuccessful.

After this Riley started a rivalry with Ryusuke Taguchi and the rest of the members of the stable, Apollo 555 which would last for the rest of the year and ended with Ryusuke Taguchi being victorious over Riley.

Riley continued his run as a singles competitor and announced his involvement in the G1 Climax tournament. Riley would go on to win all nine of his matches and would win the Tournament defeating Togi Makabe in the finals. After winning the tournament, Riley began a feud with Shinsuke Nakamura over the vacant IWGP Heavyweight Championship. In what is being billed as one of Riley's best matches to date he was able to defeat Shinsuke Nakamura and capture his first IWGP Heavyweight Championship.

Riley would hold onto the championship for well over two months before losing the title to Togi Makabe. Riley would change his ring name to Michael Riley shortly after this would make the transition into a narcissistic and self-centered villain. Riley would defeat Makabe to regain the IWGP Heavyweight Championship and would hold onto it for five months before he was defeated by Satoshi Kojima. Following this Riley would take a hiatus from the ring.

Riley returned six months later and would save current IWGP Heavyweight Champion, Hiroshi Tanahashi from an attack by Apollo 555 thus turning him back into a fan favourite. The two would align and be involved in a series of matches with Apollo 555's Prince Devitt and Ryusuke Taguchi. The two would defeat them in a match with Tanahashi's IWGP Heavyweight title on the line as well as the Tag Team titles starting Riley's second reign as Tag Team Champion. Tanahashi and Riley would hold onto the titles for a few months before losing them back at Apollo 555.

After beating Hiroshi Tanahashi in a non-title match, Riley earned himself a shot at the IWGP Heavyweight Championship. Riley's received his title shot on May 28, 2011 against Tanahashi in a two out of three falls match, for the IWGP Heavyweight Championship which he won; winning the title for the third time.

Riley would lose the title back to Tanahashi a week later after interference from Kazuchika Okada, marking the beginning of a long feud between Riley and Okada. A week later Riley assaulted Okada as the two men brawled only for Apollo 555 to interfere on Okada's behalf and attacked Riley before putting him through a table, which marked the beginning of an alliance between Okada and Apollo 55 who also happened to be the reigning IWGP Tag Team Champions along with Prince Devitt being the reigning IWGP Junior Heavyweight Champion. Riley would then challenge Devitt for the Junior Heavyweight Championship however he would lose due to interference from Okada again which then led to a three on one beatdown only for him to be saved by IWGP Intercontinental Champion, Shinsuke Nakamura. The two would team up in a match against Apollo 55 and would get a victory after Riley pinned Devitt. It was then announced that Riley would face Okada in a No Disqualifications match with the winner getting a title shot at Nakamura's Intercontinental Championship.

Riley would defeat Okada despite interference from Apollo 55 after a grueling thirty minute match which was later given five stars by Dave Meltzer of Wrestling Observer Newsletter. Riley would receive his title match at Wrestle Kingdom 7 on February 29, 2012. Riley would go on to defeat Nakamura to win his first Intercontinental Championship. Riley later went on to successful defend the title against the likes of Nakamura, Devitt, Yujiro Takahashi before losing it to Okada. After this Riley made it known that he wanted the World title back that was ripped away from him by Okada and challenged any superstar to face him in the ring for the opportunity to become number one contender. The challenge would be answered in the form of Karl Anderson who believed that he deserved a shot at the IWGP Heavyweight Championship and that Riley has had plenty of chances.

Anderson would then attack Riley which brought out the champion Tanahashi who agreed that both men deserve a shot at the title and that he wanted to face both of them in a triple threat match. The match was made and Riley would come up short in his quest to reclaim the title after Anderson was pinned by Tanahashi. Shortly after this Riley would slowly begin a heel turn as following his matches he wouldn't let up on his opponents and would attack them after he had already won the match. Along with his heel turn, Riley also got rid of his long hair, but cutting it off. Attacking the likes of MVP, Hirooki Goto, Satoshi Kojima and Junji Hirata. This too brought out Tanahashi who didn't like how Riley was attacking his opponents after his matches and formerly offered to give him the rematch that he had wanted, to which Riley accepted. The match was made for the following week. Riley would defeat Tanahashi after interference from Ten-Koji winning the title for the fourth time. It was revealed a few weeks later that Riley had paid off Ten-Koji to help him win, leading up to a Six Man Tag Match being scheduled between Ten-Koji and Riley against the team of Tanahashi, MVP and Masato Tanaka. The match would be ruled a no contest after both teams brawled with Riley getting one over on Tanahashi and putting him through a table.

Riley would go onto successful defend the title against Tanahashi with Ten-Koji banned from interfering thus ending their feud. Following this Riley would go onto defend the title successfully against the likes of Tanaka, Karl Anderson, MVP, Shelton Benjamin, Yuji Nagata, Yujiro Takahashi, Davey Boy Smith Jr, Alex Koslov and Alex Shelley before losing the title to Hiroshi Tenzan ending his reign at 333 days. After this Riley would take a brief hiatus from wrestling, before returning eight months later retaining his heel character from before as the mystery opponent for then reigning IWGP Heavyweight Champion, Kazuchika Okada where Riley would defeat him after putting his feet on the ropes unseen by the referee thus winning the title for the fifth time. Riley would go on to hold the title for 126 days before losing it back to Okada in a Loser leaves NJPW match. Following the match Riley's contract would expire and he opted not to renew it.

In late July, Riley also signed a contract with World Elite Wrestling and was assigned to their developmental territory TNT. After losing his first three matches, Daniels defeated Jeffrey in what would be his last match as he would later announce his retirement from pro wrestling in November 2013, effectively parting ways with WEW. Both sides have left the door open for a possible return down the road.

On June 29, 2014 seven months after Daniels retired he made a return to WEW at Legacy: Jamaica as a special guest where he got into a confrontation with Lukas Jacobs where the latter disrespected Daniels claiming he was hogging the spotlight who then proceeded to slap Daniels and ended up on the receiving end of a Spear. A week later it was revealed that Daniels had signed a new contract with WEW and was named the new Assistant General Manager of Adrenaline.

Riley has an older brother, Thomas Riley who is a singer-songwriter who's collaborated with such artists as Enrique Iglesias and Pitbull.

Riley was previously in a relationship with model Danielle Higgins, but the two have since broken up. Riley previously dated British actress Kate Beckinsale. They began dating in mid October 2011. On December 6, 2011 Riley was involved in an altercation with Kate Beckinsale's ex-husband, Len Wiseman which lead Riley ending up punching Wiseman in the jaw. Wiseman intended to file a lawsuit against Riley however it was later dropped. In early March 2012, Riley ended his four-month relationship with Beckinsale which garnered a lot of media attention.

Riley met Mariella Lucato at a study abroad trip in Italy during his junior year in high school. The two immediately hit it off and began dating during his time there. The relationship ended when he had to return to the US. In mid-July 2012 the two became engaged after re-connecting following his breakup with Beckinsale and planned an October wedding. However they called off their engagement in August. The day after the supposed wedding date (10/15/12) Daniel showed up at her home in Rome, Italy. The two reconciled after he found out that she was pregnant with their child and he proposed to her again, which she accepted. The two would wed in March 2013 at Lanikuhonua Cultural Institute in Kapolei, Hawaii. In May 2013, Mariella gave birth to an 8 lbs baby boy they named Luca Daniel. The family resides in Toronto, Canada during the Summer and in Miami, Florida during the Winter. On December 18, 2013 Riley announced on Twitter that him and his wife were expecting their second child. The couple welcomed Noëlle Willow Riley on April 20, 2014 who weighted in at 10 lbs. In November 2014, Mariella and reveled to her husband via Twitterthat she was pregnant with their third child. The baby, a girl they're naming Sofia Violet, is due in mid-2015. On April 20, 2015, Mariella gave birth to their third child, a girl.